Did you book this with BA or AA or an agent? I found a portland route on google flights with BA long hauls and number of AA flights. It said to call BA to book for around £1500, called them and they told me they cannot include AA flights in a booking that do not have a BA codeshare. Clicked through GF to book online with AA and when I got to the seat selection and checkout, all the flights were showing as economy instead of business. Tried the multi city seach several times on AA to build the flights manually but it keeps coming back "something went wrong, try later"